On Tue, 2009-10-06 at 10:44 -0500, Dwight Schauer wrote: > http://stackoverflow.com/questions/918676/generate-sha-hash-in-openssl > > Replace SHA1 with SHA256. > Replace 20 with SHA256_DIGEST_LENGTH. >
> > Could someone point me to an example C program, docs that show how to > generate a sha-256 digest for a buffer? Thanks, I also ran across this https://www.mirbsd.org/htman/i386/man3/sha2.htm which has an example that works with minor tweaks EXAMPLES The following code fragment will calculate the SHA-256 digest for the string "abc", which is "0xba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad". SHA256_CTX ctx; u_int8_t results[SHA256_DIGEST_LENGTH]; char *buf; int n; buf = "abc"; n = strlen(buf); SHA256_Init(&ctx); SHA256_Update(&ctx, (u_int8_t *)buf, n); SHA256_Final(results, &ctx); /* Print the digest as one long hex value */ printf("0x"); for (n = 0; n < SHA256_DIGEST_LENGTH; n++) printf("%02x", results[n]); putchar('\n'); ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
